| Summary: | 碩士 === 元智大學 === 化學工程與材料科學學系 === 98 === Electrospun fibrous membranes and cast membranes with the blends of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx)/poly(L-lactic acid) (PLLA) in various compositions were fabricated. The aim of this study was to make comparison of those membranes and identify the chain packing and phase behaviors in the cast and electrospun membranes with a blend of two crystallizable bio-polyesters. Some characteristic effects of electrospinning, such as the fast solvent evaporation, stress on the fibers due to electric field, and fiber size limitation, could result in the differences in chain packing, phase separation, partially mixed amorphous region, and limited crystallinity of the blends of PHBHHx/PLLA. The thermal properties were observed by differential scanning calorimetry (DSC), and the crystalline behaviors were characterized by wild-angle X-ray scattering (WAXS), and small-angle X-ray scattering (SAXS). The phase separation behavior in the blends was confirmed by using field emission scanning electron microscopy (FESEM) after an etching treatment. According to those results, a model of the chain packing in electrospun fibers of PHBHHx/PLLA blends could be constructed.
|
|---|
